:lol: realy excelentis ist possible to build yout applet into a german physik site - of course by telling your name as construktor of the appletand sending the lin on this side to yougreetings wolfgang

is there any possibility to use your applet for teching purposes offline?at our school we do not have an internet connection in our physics lab so i would be most greatfull if you woul add the "get applet button" for this applet too.

I get this message from hotmail, Note: There is no cure available for the virus on the file eyewatch.zip

It is not possible to download files from Hotmail that contain incurable viruses. Contact the originator of the file, inform them that the file contains a virus, and ask them to send a virus-free version of the file.Please help.

What you need is register at our web site and login to the system.You will find download button , click the button and files related to the simulation will be sent to your email address.This work for all the simulation web page on this server.Check out URL http://www.phy.ntnu.edu.tw/ntnujava/ and register from the right frame.

This is a great applet, the only things I would suggest are giving it units of measure. Particularly Diameter of the Lens, the lens SAG heights which would in turn tie into total Thickness of the Lens, and distance of the Focal Point. A very, very good applet for helping visualize what is going on though.

When you take a narrow bunch of rays you obtain a focus. If not you can see another interesting thing - a caustic. The applet gives a great explanation of the figures made by light on the bottom of shiny (e.g. metal) mugs owing to reflection and outside a glass of water owing to refraction. I dream about such an applet generating caustics in 3D for lenses and bottles when a bunch of sun rays falls at different angles on the objects.

professor,can u show me how to use the simulation to adjust the thickness of the lens to see how it affect the focal length of the lens? whenever i try to change the width the left and right curvature keeps auto adjust. hence i can never keep the variable constant. thx